Neko1kat
11.07.2021 •
Mathematics
The area of a circle is 80.86cm2.
Find the length of the radius rounded to 2 DP.
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Ответ:
Solution given:
The area of a circle =80.86cm²
we have:
The area of a circle =πr²
substituting value of area of circle we get
80.86cm=3.14*r²
dividing both side by 3.14
80.86/3.14=3.14*r²/3.14
25.75=r²
doing square root on both side
r=5.07cm
The length of radius is 5.07cm
Ответ:
=
3
2
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